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| author | Alexander Graf | 2012-04-25 14:29:57 +0200 |
|---|---|---|
| committer | Alexander Graf | 2012-05-06 16:19:09 +0200 |
| commit | af415087d2bbbef3cc25cdf371bfb0460cf66b3b (patch) | |
| tree | b8b2ec53eb2607bccb8ecf66c1869a42f1dd2034 | |
| parent | KVM: PPC: Book3S: PR: Optimize entry path (diff) | |
| download | kernel-qcow2-linux-af415087d2bbbef3cc25cdf371bfb0460cf66b3b.tar.gz kernel-qcow2-linux-af415087d2bbbef3cc25cdf371bfb0460cf66b3b.tar.xz kernel-qcow2-linux-af415087d2bbbef3cc25cdf371bfb0460cf66b3b.zip | |
KVM: PPC: Book3S: PR: No isync in slbie path
While messing around with the SLBs we're running in real mode. The
entry to guest space goes through rfid, which is context synchronizing,
so there's no need to manually synchronize anything through isync.
With this patch and a simple priviledged SPR access loop guest, I get
a speed bump from 2035607 to 2181301 exits per second.
Signed-off-by: Alexander Graf <agraf@suse.de>
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_slb.S | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/powerpc/kvm/book3s_64_slb.S b/arch/powerpc/kvm/book3s_64_slb.S index f2e6e48ea463..56b983e7b738 100644 --- a/arch/powerpc/kvm/book3s_64_slb.S +++ b/arch/powerpc/kvm/book3s_64_slb.S @@ -90,8 +90,6 @@ slb_exit_skip_ ## num: or r10, r10, r12 slbie r10 - isync - /* Fill SLB with our shadow */ lbz r12, SVCPU_SLB_MAX(r3) |